Re: Try this one!

1, 3, 9, and 27 kg

1 kg can be directly weighed3-1=2, (Which means putting 3kg on the left pan and 1kg on the right,2kg of material can be got)3 can be directly weighed,3+1=4,9-(3+1)=5,9-3=6,(9+1)-3=7,9-1=8,9 can be directly weighed,9+1=10 and so on.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Re: Try this one!

Agreed,MIF. Some of us are so slow,that we reply 7 years later.

Here lies the reader who will never open this book. He is forever dead.Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and PunishmentThe knowledge of some things as a function of age is a delta function.